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Integrated Gasification Combined Cycle

Schematic of integrated gasification combined cycle

An integrated gasification combined cycle is schematically shown in the figure. Solid fuel with a lower heating value of 18080 kJ/lg is converted to syngas in the gasifier. The syngas composition is H2 (15.8%), CO (22.4%), CO2 (11%), CH4 (1%), H2O (9.3%), N2 (40.5%). The syngas exiting the gasifier at 973 K is cooled and desulphurized. The cleaned gas at 573 K is fed to the water gas shift (WGS) reactor where the carbon monoxide reacts with water supplied separately to yield additional hydrogen and carbon dioxide. Air at 298 K and 1 bar is pressurized to 15 bar within the compressor. It is then split between the gasifier and the combustor. The gaseous fuel leaving the WGS reactor is combusted in the air which yields combustion products comprising CO2/H2O/O2/N2 at 1623 K. The combustion products are expanded within the turbine down to the atmospheric pressure. The rate at which the solid fuel is supplied to the gasifier is 0.5 kg/s. The air flowrate required for the gasification process is 0.8 Nm^3/s. The isentropic efficiencies of the compressor and turbine are 0.85 and 0.9, respectively. Determine the thermal efficiency of the cycle.

Compressor

IGGC-Solution 1.png

Gasifier

IGGC-Solution 2.png
IGGC-Solution 3.png

WGS Reactor

IGGC-Solution 4.png

Combustor

IGGC-Solution 5.png
IGGC-Solution 6.png

Gas Turbine

IGGC-Solution 7.png

Thermal Efficiency

IGGC-Solution 8.png
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